<s>
In	O
computer	B-General_Concept
science	I-General_Concept
,	O
particularly	O
the	O
field	O
of	O
databases	O
,	O
the	O
Thomas	B-General_Concept
write	I-General_Concept
rule	I-General_Concept
is	O
a	O
rule	O
in	O
timestamp-based	B-Operating_System
concurrency	I-Operating_System
control	I-Operating_System
.	O
</s>
<s>
The	O
Thomas	B-General_Concept
write	I-General_Concept
rule	I-General_Concept
is	O
applied	O
in	O
situations	O
where	O
a	O
predefined	O
logical	O
order	O
is	O
assigned	O
to	O
transactions	O
when	O
they	O
start	O
.	O
</s>
<s>
Enforcing	O
the	O
Thomas	B-General_Concept
write	I-General_Concept
rule	I-General_Concept
only	O
requires	O
checking	O
to	O
see	O
if	O
the	O
write	O
timestamp	O
of	O
the	O
object	O
is	O
greater	O
than	O
the	O
time	O
stamp	O
of	O
the	O
transaction	O
performing	O
a	O
write	O
.	O
</s>
